Stefan and Jodok talk about building RESTful APIs for Web 2.0 services.
Plone, like many other Web frameworks, sometimes has trouble talking to other technology stacks. REST provides a very simple and standards-compliant method to communicate any data with other technologies. REST also allows Plone/Zope sites to communicate with each other more easily. REST allows your Plone solutions to scale better. For example, you can "outsource" expensive, high-availability features such as tagging, rating, cataloging, file transcoding, to other servers, and then bring the results back to Plone via REST. In this talk Richter and Batlogg present their approach to building RESTful services in Plone/Zope and show real-life examples of these services in action.